Master Plan for the Reconstruction and Add Lane on the Tri-State Tollway

Owner: Illinois State Toll Highway Authority
Location: Lake County, Illinois

This project involved the master plan development for the proposed reconstruction and add-lane for the Tri-State Tollway between Mile Post 56.5 (Half Day Road) to Mile Post 62.3 (IL 176) in Lake County, Illinois.

IEI developed the existing drainage layout for a drainage study, identified drainage problems, performed hydrologic calculations for the existing drainage condition, and contributed to the Location Drainage Study Report.